18 Carat Gold in Engagement Rings & Fine Jewellery
18 carat gold (750) is 75% pure gold alloyed with metals like copper, silver or palladium — strong enough for a ring worn daily, while keeping noticeably more gold colour and value than 9ct. It's the UK jeweller's default recommendation for engagement and wedding rings set with diamonds or other stones, since it holds claws and settings securely without excessive wear over years of wear.
Other Purities & Related Pages
24 Carat (24k)
Hallmark 999
22 Carat (22k)
Hallmark 916
21 Carat (21k)
Hallmark 875
14 Carat (14k)
Hallmark 585
9 Carat (9ct)
Hallmark 375
Scrap Gold
Selling & dealer estimate
Price History
Chart & trend
Per Troy Ounce
Bullion-unit pricing
Sovereign Coins
Sovereign, half-Sovereign, Britannia
Main Calculator
All purities in one tool
Methodology
Data source & formula
Frequently Asked Questions
750 indicates 75% pure gold by weight — the standard hallmark for 18 carat gold, the most common choice for UK engagement and wedding rings.
Neither is objectively "better" — 18 carat has more gold and colour but is softer, while 9 carat is more scratch-resistant and cheaper. 18 carat is preferred for rings with stone settings; 9 carat suits everyday, budget-conscious pieces.